Iprovement in the method of making patterns for casting hollow ware and other ar



UNITED STATES PATENT OFFICE. I

EZRA RlPLEY,--OF TROY, NEW YORK. 1 f

IPROVEMENT IN THE METHOD OF MAKING PATTERNS FOR CASTING HOLLOW WARE AND OTHER AIL TICLES OF METAL IN WHICH THE INNER AND OUTER PATTERNS ARE REQUIRED TO BE OF A COR- RESPON DING FIGURE.

Specification forming part of Letters Patent No. 3,724, dated August 31, 184 4. I

To all whom it may concern:

Be'it known that I, EZRA RIPLEY, of the city of Troy, county of Rensselacr, and State of New York, have invented a new and useful Improvementin the Art of Pattern-Making for Oastingsin Iron or other Metals; and I do hereby declare that the following is afnll and exact description.

Thenatureof my invention consists in pro curing a second or cast-iron pattern of any plate or hollow ware,of nearly a'nniform thickness, directly from the firstorblock pattern by means of the intervention of a. coating of oilpaintand sand or other suitable composition of v the samethickness ot' the required pattern, thus obviating the necessity of excavating or relieving the back side of the pattern.

To enable others skilled in the art to use my invention, I will proceed to describe its operation.

I first make a block-pattern-that is, an exact pattern of the face or outer surface of the desired castin g, and which may be carved at pleasure in any shape or form, and in anyfig- .nres in however bold relief, and withoutany regard to the proposed thickness of the desired plate or other casting. This Icalla block or first pattern. The surface of. this block-pattern is perfectly finished and varnished. I then take from this block-pattern a plaster cast, which is obtained in the ordinary mode of obtaining plaster casts by laying-the block-pattern in a molders flask or box and-pouring in plaster upon its finished 1 a coating of oil-paint and sand, or any other suitable composition, equal in thickness to the 7 second or past-iron pattern afterward to be obtained. This coating, when made of Oil-' paint or other a'dhcsivesnbstance and sand, is'obtained by laying onto the surface of the cast an even coat of oil-paint, and while the paint is green or undried covering the painted to obtain the required thickness. This is the process-best adapted to patternsof ornamental and intricate carved work. \Vhen the pat tern sought is plain hollow warc or other nearly even surface the cast may be more convenientl y coated with putty or plastic or inalleable substance laid on of the required thickness and uniformity.

To obtain the second pattern or cast-iron plate or'. figure required from the block-pat.-

tern and cast as above prepared, the molder proceeds in the following manner: He first leys..the.i astcr.cast asahoyenreparcd on the ground, facing upward, and places that part of his flask called the nowel over and resting on the plaster cast so as to form a box around its uppersurfacc, and rams the flask full ofmoiding-sand, compressed and packed in the ordinary form of molding. The uowel is then reversed or turned upside down and the plaster cast removed, leaving an exact-impressiorrof its/surface in the sand. The part of the flask called the cope is then placed over and 'resting uponthe first or block-pattern, which lies with the pattern-face upward, and rammed up with molding-sand packed and compressed in the usual mode. The cope is then turned upside down and the block-pattern removed, leavingan exact impression of its pa'ttern-surfacei'n thesnnd. The nowel and cope are then placed together in the same manner as is done in ordinary molding after the pattern is ren1oved,and the'motal is pouredin in the ordinary mode, and thus a perfect iron plate or second pattern is obtained of ncarly uniform thickness, and the innernand outer surface corresponding respectively with the surface of the block-pattern and the plaster cast.

The peculiar advantages .of my invention over the ordinary modes of pattern-making heretofore in use are facility and chcapness.

I have contemplated the application of my a of thiclmess-is:desired.'

.to' secure by Lefl'ler's Patent, 'is-- v invention pattelfnsofallmaune r of czisting s in iron when uniformity particnlav variety.

What "I claim aq my invention, 5nd

7 desir The mode 01 manner In which I'obtain iron ,5 or other metallic castings or second patterns of n n'iagrlyuuiform thickness bymemis of spread 'mg gn'fy suitable material or composition on 'to' be obtained, and'the principle involved SliGlllDQdB of'pn'oceeding's. a I EZRA-31mm,-

Wihiesses:

Emsqms GEEK, A ABRAM-GOXL 

